Flexible Plate Impact on a Water Surface
Abstract
An experimental investigation of air entrainment at the free surface of the turbulent boundary layer along the hull of naval combatant ships is proposed. The hull boundary layer will be simulated in the laboratory as a temporally evolving boundary layer created by a suddenly started surface-piercing flat wall that will move at full scale ship speeds (15~m/s). In this experiment, the boundary layer at each instant in time (t) after the start of the wall motion is equivalent to the boundary layer on the full-scale ship at a distance of x = Ut from the ship stem, where U is the ship speed. The moving wall is created by one side of a one-meter-wide stainless steel belt loop that is driven by two vertically oriented drums that are separated horizontally by a distance of 7.5 m. By using this belt system, full scale turbulent Froude and Weber numbers, which are necessary to simulate the air entrainment, will be obtained in the laboratory and the boundary layer is isolated from the effects of breaking bow waves, which are also known to entrain air. The free surface shape and motion will be measured with a cinematic laser induced fluorescence technique, the turbulent fluid motions will be measured with a cinematic stereo particle image velocimetry system and the bubbles will be measured with a cinematic stereo photography technique.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Nov 23, 2016
- Source ID
- N000141612619
Entities
People
- James S Duncan
Organizations
- Office of Naval Research
- United States Navy
- University of Maryland